Impact copolymer compositions for use in corrugated board
US9109106B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2011 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Jul 4, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24694
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to polymer compositions comprising a propylene impact copolymer and a processing aid, as well as corrugated boards made from such compositions. The impact copolymer has a melt flow range of from 1.5 to 3.5 g/10 min and a dispersed phase content of from 5 to 30% by weight. The dispersed phase of the impact copolymer has an ethylene content of from 30- to 70% by weight of the dispersed phase. The matrix phase of the impact copolymer is a propylene homopolymer or a random copolymer comprising units derived from propylene and a second copolymer selected from either ethylene or 1-butene wherein the units derived from the second copolymer comprise from 0 to 5% by weight of the dispersed phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.